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Arm FF-A firmware driver updates for v6.1

Browse source 
Small set of changes in preparation to add support for FF-A v1.1
 specification later. It mainly contains:
 
 1. Splitting up ffa_ops into different categories namely information,
    message and memory. It helps to make info and memory operations
    independent from ffa_device so thata generic memory management
    module can use it without specific ffa_dev.
 2. Adds support for querying FF-A features and use the same to detect
    the support for 64-bit operations.
 3. Adds v1.1 get_partition_info support and use the same to set up
    32-bit execution mode flag automatically.
 4. Adds pointer to the ffa_dev_ops in struct ffa_dev and drop
    ffa_dev_ops_get() which enables to drop ffa_ops in optee_ffa
    structure using ffa_dev->ops directly. Additionally ffa_dev_ops is
    renamed as ffa_ops.
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Merge tag 'ffa-updates-6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into arm/drivers

Arm FF-A firmware driver updates for v6.1

Small set of changes in preparation to add support for FF-A v1.1
specification later. It mainly contains:

1. Splitting up ffa_ops into different categories namely information,
   message and memory. It helps to make info and memory operations
   independent from ffa_device so thata generic memory management
   module can use it without specific ffa_dev.
2. Adds support for querying FF-A features and use the same to detect
   the support for 64-bit operations.
3. Adds v1.1 get_partition_info support and use the same to set up
   32-bit execution mode flag automatically.
4. Adds pointer to the ffa_dev_ops in struct ffa_dev and drop
   ffa_dev_ops_get() which enables to drop ffa_ops in optee_ffa
   structure using ffa_dev->ops directly. Additionally ffa_dev_ops is
   renamed as ffa_ops.

* tag 'ffa-updates-6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux:
  firmware: arm_ffa: Split up ffa_ops into info, message and memory operations
  firmware: arm_ffa: Set up 32bit execution mode flag using partiion property
  firmware: arm_ffa: Add v1.1 get_partition_info support
  firmware: arm_ffa: Rename ffa_dev_ops as ffa_ops
  firmware: arm_ffa: Make memory apis ffa_device independent
  firmware: arm_ffa: Use FFA_FEATURES to detect if native versions are supported
  firmware: arm_ffa: Add support for querying FF-A features
  firmware: arm_ffa: Remove ffa_dev_ops_get()
  tee: optee: Drop ffa_ops in optee_ffa structure using ffa_dev->ops directly
  firmware: arm_ffa: Add pointer to the ffa_dev_ops in struct ffa_dev

Link: https://lore.kernel.org/r/20220913100612.2924643-1-sudeep.holla@arm.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2022-09-15 22:07:06 +02:00
commit 387969b7ab
5 changed files with 152 additions and 67 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
drivers/firmware/arm_ffa/bus.c
View file

@ -167,7 +167,8 @@ bool ffa_device_is_valid(struct ffa_device *ffa_dev)
return valid;
}
struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id)
struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id,
const struct ffa_ops *ops)
{
int ret;
struct device *dev;
@ -183,6 +184,7 @@ struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id)
dev_set_name(&ffa_dev->dev, "arm-ffa-%04x", vm_id);
ffa_dev->vm_id = vm_id;
ffa_dev->ops = ops;
uuid_copy(&ffa_dev->uuid, uuid);
ret = device_register(&ffa_dev->dev);

132
drivers/firmware/arm_ffa/driver.c
View file

@ -163,6 +163,7 @@ struct ffa_drv_info {
struct mutex tx_lock; /* lock to protect Tx buffer */
void *rx_buffer;
void *tx_buffer;
bool mem_ops_native;
};
static struct ffa_drv_info *drv_info;
@ -263,18 +264,24 @@ static int ffa_rxtx_unmap(u16 vm_id)
return 0;
}
#define PARTITION_INFO_GET_RETURN_COUNT_ONLY BIT(0)
/* buffer must be sizeof(struct ffa_partition_info) * num_partitions */
static int
__ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3,
struct ffa_partition_info *buffer, int num_partitions)
{
int count;
int idx, count, flags = 0, sz, buf_sz;
ffa_value_t partition_info;
if (!buffer || !num_partitions) /* Just get the count for now */
flags = PARTITION_INFO_GET_RETURN_COUNT_ONLY;
mutex_lock(&drv_info->rx_lock);
invoke_ffa_fn((ffa_value_t){
.a0 = FFA_PARTITION_INFO_GET,
.a1 = uuid0, .a2 = uuid1, .a3 = uuid2, .a4 = uuid3,
.a5 = flags,
}, &partition_info);
if (partition_info.a0 == FFA_ERROR) {
@ -284,8 +291,19 @@ __ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3,
count = partition_info.a2;
if (drv_info->version > FFA_VERSION_1_0) {
buf_sz = sz = partition_info.a3;
if (sz > sizeof(*buffer))
buf_sz = sizeof(*buffer);
} else {
/* FFA_VERSION_1_0 lacks size in the response */
buf_sz = sz = 8;
}
if (buffer && count <= num_partitions)
memcpy(buffer, drv_info->rx_buffer, sizeof(*buffer) * count);
for (idx = 0; idx < count; idx++)
memcpy(buffer + idx, drv_info->rx_buffer + idx * sz,
buf_sz);
ffa_rx_release();
@ -571,6 +589,39 @@ static int ffa_memory_reclaim(u64 g_handle, u32 flags)
return 0;
}
static int ffa_features(u32 func_feat_id, u32 input_props,
u32 *if_props_1, u32 *if_props_2)
{
ffa_value_t id;
if (!ARM_SMCCC_IS_FAST_CALL(func_feat_id) && input_props) {
pr_err("%s: Invalid Parameters: %x, %x", __func__,
func_feat_id, input_props);
return ffa_to_linux_errno(FFA_RET_INVALID_PARAMETERS);
}
invoke_ffa_fn((ffa_value_t){
.a0 = FFA_FEATURES, .a1 = func_feat_id, .a2 = input_props,
}, &id);
if (id.a0 == FFA_ERROR)
return ffa_to_linux_errno((int)id.a2);
if (if_props_1)
*if_props_1 = id.a2;
if (if_props_2)
*if_props_2 = id.a3;
return 0;
}
static void ffa_set_up_mem_ops_native_flag(void)
{
if (!ffa_features(FFA_FN_NATIVE(MEM_LEND), 0, NULL, NULL) ||
!ffa_features(FFA_FN_NATIVE(MEM_SHARE), 0, NULL, NULL))
drv_info->mem_ops_native = true;
}
static u32 ffa_api_version_get(void)
{
return drv_info->version;
@ -597,11 +648,19 @@ static int ffa_partition_info_get(const char *uuid_str,
return 0;
}
static void ffa_mode_32bit_set(struct ffa_device *dev)
static void _ffa_mode_32bit_set(struct ffa_device *dev)
{
dev->mode_32bit = true;
}
static void ffa_mode_32bit_set(struct ffa_device *dev)
{
if (drv_info->version > FFA_VERSION_1_0)
return;
_ffa_mode_32bit_set(dev);
}
static int ffa_sync_send_receive(struct ffa_device *dev,
struct ffa_send_direct_data *data)
{
@ -609,17 +668,15 @@ static int ffa_sync_send_receive(struct ffa_device *dev,
dev->mode_32bit, data);
}
static int
ffa_memory_share(struct ffa_device *dev, struct ffa_mem_ops_args *args)
static int ffa_memory_share(struct ffa_mem_ops_args *args)
{
if (dev->mode_32bit)
return ffa_memory_ops(FFA_MEM_SHARE, args);
if (drv_info->mem_ops_native)
return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args);
return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args);
return ffa_memory_ops(FFA_MEM_SHARE, args);
}
static int
ffa_memory_lend(struct ffa_device *dev, struct ffa_mem_ops_args *args)
static int ffa_memory_lend(struct ffa_mem_ops_args *args)
{
/* Note that upon a successful MEM_LEND request the caller
* must ensure that the memory region specified is not accessed
@ -628,36 +685,47 @@ ffa_memory_lend(struct ffa_device *dev, struct ffa_mem_ops_args *args)
* however on systems without a hypervisor the responsibility
* falls to the calling kernel driver to prevent access.
*/
if (dev->mode_32bit)
return ffa_memory_ops(FFA_MEM_LEND, args);
if (drv_info->mem_ops_native)
return ffa_memory_ops(FFA_FN_NATIVE(MEM_LEND), args);
return ffa_memory_ops(FFA_FN_NATIVE(MEM_LEND), args);
return ffa_memory_ops(FFA_MEM_LEND, args);
}
static const struct ffa_dev_ops ffa_ops = {
static const struct ffa_info_ops ffa_drv_info_ops = {
.api_version_get = ffa_api_version_get,
.partition_info_get = ffa_partition_info_get,
};
static const struct ffa_msg_ops ffa_drv_msg_ops = {
.mode_32bit_set = ffa_mode_32bit_set,
.sync_send_receive = ffa_sync_send_receive,
};
static const struct ffa_mem_ops ffa_drv_mem_ops = {
.memory_reclaim = ffa_memory_reclaim,
.memory_share = ffa_memory_share,
.memory_lend = ffa_memory_lend,
};
const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev)
{
if (ffa_device_is_valid(dev))
return &ffa_ops;
return NULL;
}
EXPORT_SYMBOL_GPL(ffa_dev_ops_get);
static const struct ffa_ops ffa_drv_ops = {
.info_ops = &ffa_drv_info_ops,
.msg_ops = &ffa_drv_msg_ops,
.mem_ops = &ffa_drv_mem_ops,
};
void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid)
{
int count, idx;
struct ffa_partition_info *pbuf, *tpbuf;
/*
* FF-A v1.1 provides UUID for each partition as part of the discovery
* API, the discovered UUID must be populated in the device's UUID and
* there is no need to copy the same from the driver table.
*/
if (drv_info->version > FFA_VERSION_1_0)
return;
count = ffa_partition_probe(uuid, &pbuf);
if (count <= 0)
return;
@ -671,6 +739,7 @@ void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid)
static void ffa_setup_partitions(void)
{
int count, idx;
uuid_t uuid;
struct ffa_device *ffa_dev;
struct ffa_partition_info *pbuf, *tpbuf;
@ -681,19 +750,24 @@ static void ffa_setup_partitions(void)
}
for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) {
/* Note that the &uuid_null parameter will require
import_uuid(&uuid, (u8 *)tpbuf->uuid);
/* Note that if the UUID will be uuid_null, that will require
* ffa_device_match() to find the UUID of this partition id
* with help of ffa_device_match_uuid(). Once the FF-A spec
* is updated to provide correct UUID here for each partition
* as part of the discovery API, we need to pass the
* discovered UUID here instead.
* with help of ffa_device_match_uuid(). FF-A v1.1 and above
* provides UUID here for each partition as part of the
* discovery API and the same is passed.
*/
ffa_dev = ffa_device_register(&uuid_null, tpbuf->id);
ffa_dev = ffa_device_register(&uuid, tpbuf->id, &ffa_drv_ops);
if (!ffa_dev) {
pr_err("%s: failed to register partition ID 0x%x\n",
__func__, tpbuf->id);
continue;
}
if (drv_info->version > FFA_VERSION_1_0 &&
!(tpbuf->properties & FFA_PARTITION_AARCH64_EXEC))
_ffa_mode_32bit_set(ffa_dev);
}
kfree(pbuf);
}
@ -751,6 +825,8 @@ static int __init ffa_init(void)
ffa_setup_partitions();
ffa_set_up_mem_ops_native_flag();
return 0;
free_pages:
if (drv_info->tx_buffer)

46
drivers/tee/optee/ffa_abi.c
View file

@ -271,8 +271,8 @@ static int optee_ffa_shm_register(struct tee_context *ctx, struct tee_shm *shm,
unsigned long start)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops;
struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
const struct ffa_mem_ops *mem_ops = ffa_dev->ops->mem_ops;
struct ffa_mem_region_attributes mem_attr = {
.receiver = ffa_dev->vm_id,
.attrs = FFA_MEM_RW,
@ -294,14 +294,14 @@ static int optee_ffa_shm_register(struct tee_context *ctx, struct tee_shm *shm,
if (rc)
return rc;
args.sg = sgt.sgl;
rc = ffa_ops->memory_share(ffa_dev, &args);
rc = mem_ops->memory_share(&args);
sg_free_table(&sgt);
if (rc)
return rc;
rc = optee_shm_add_ffa_handle(optee, shm, args.g_handle);
if (rc) {
ffa_ops->memory_reclaim(args.g_handle, 0);
mem_ops->memory_reclaim(args.g_handle, 0);
return rc;
}
@ -314,8 +314,9 @@ static int optee_ffa_shm_unregister(struct tee_context *ctx,
struct tee_shm *shm)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops;
struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
const struct ffa_msg_ops *msg_ops = ffa_dev->ops->msg_ops;
const struct ffa_mem_ops *mem_ops = ffa_dev->ops->mem_ops;
u64 global_handle = shm->sec_world_id;
struct ffa_send_direct_data data = {
.data0 = OPTEE_FFA_UNREGISTER_SHM,
@ -327,11 +328,11 @@ static int optee_ffa_shm_unregister(struct tee_context *ctx,
optee_shm_rem_ffa_handle(optee, global_handle);
shm->sec_world_id = 0;
rc = ffa_ops->sync_send_receive(ffa_dev, &data);
rc = msg_ops->sync_send_receive(ffa_dev, &data);
if (rc)
pr_err("Unregister SHM id 0x%llx rc %d\n", global_handle, rc);
rc = ffa_ops->memory_reclaim(global_handle, 0);
rc = mem_ops->memory_reclaim(global_handle, 0);
if (rc)
pr_err("mem_reclaim: 0x%llx %d", global_handle, rc);
@ -342,7 +343,7 @@ static int optee_ffa_shm_unregister_supp(struct tee_context *ctx,
struct tee_shm *shm)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops;
const struct ffa_mem_ops *mem_ops;
u64 global_handle = shm->sec_world_id;
int rc;
@ -353,7 +354,8 @@ static int optee_ffa_shm_unregister_supp(struct tee_context *ctx,
*/
optee_shm_rem_ffa_handle(optee, global_handle);
rc = ffa_ops->memory_reclaim(global_handle, 0);
mem_ops = optee->ffa.ffa_dev->ops->mem_ops;
rc = mem_ops->memory_reclaim(global_handle, 0);
if (rc)
pr_err("mem_reclaim: 0x%llx %d", global_handle, rc);
@ -529,8 +531,8 @@ static int optee_ffa_yielding_call(struct tee_context *ctx,
struct optee_msg_arg *rpc_arg)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops;
struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
const struct ffa_msg_ops *msg_ops = ffa_dev->ops->msg_ops;
struct optee_call_waiter w;
u32 cmd = data->data0;
u32 w4 = data->data1;
@ -541,7 +543,7 @@ static int optee_ffa_yielding_call(struct tee_context *ctx,
/* Initialize waiter */
optee_cq_wait_init(&optee->call_queue, &w);
while (true) {
rc = ffa_ops->sync_send_receive(ffa_dev, data);
rc = msg_ops->sync_send_receive(ffa_dev, data);
if (rc)
goto done;
@ -576,7 +578,7 @@ static int optee_ffa_yielding_call(struct tee_context *ctx,
* OP-TEE has returned with a RPC request.
*
* Note that data->data4 (passed in register w7) is already
* filled in by ffa_ops->sync_send_receive() returning
* filled in by ffa_mem_ops->sync_send_receive() returning
* above.
*/
cond_resched();
@ -652,14 +654,15 @@ static int optee_ffa_do_call_with_arg(struct tee_context *ctx,
*/
static bool optee_ffa_api_is_compatbile(struct ffa_device *ffa_dev,
const struct ffa_dev_ops *ops)
const struct ffa_ops *ops)
{
const struct ffa_msg_ops *msg_ops = ops->msg_ops;
struct ffa_send_direct_data data = { OPTEE_FFA_GET_API_VERSION };
int rc;
ops->mode_32bit_set(ffa_dev);
msg_ops->mode_32bit_set(ffa_dev);
rc = ops->sync_send_receive(ffa_dev, &data);
rc = msg_ops->sync_send_receive(ffa_dev, &data);
if (rc) {
pr_err("Unexpected error %d\n", rc);
return false;
@ -672,7 +675,7 @@ static bool optee_ffa_api_is_compatbile(struct ffa_device *ffa_dev,
}
data = (struct ffa_send_direct_data){ OPTEE_FFA_GET_OS_VERSION };
rc = ops->sync_send_receive(ffa_dev, &data);
rc = msg_ops->sync_send_receive(ffa_dev, &data);
if (rc) {
pr_err("Unexpected error %d\n", rc);
return false;
@ -687,14 +690,14 @@ static bool optee_ffa_api_is_compatbile(struct ffa_device *ffa_dev,
}
static bool optee_ffa_exchange_caps(struct ffa_device *ffa_dev,
const struct ffa_dev_ops *ops,
const struct ffa_ops *ops,
u32 *sec_caps,
unsigned int *rpc_param_count)
{
struct ffa_send_direct_data data = { OPTEE_FFA_EXCHANGE_CAPABILITIES };
int rc;
rc = ops->sync_send_receive(ffa_dev, &data);
rc = ops->msg_ops->sync_send_receive(ffa_dev, &data);
if (rc) {
pr_err("Unexpected error %d", rc);
return false;
@ -783,7 +786,7 @@ static void optee_ffa_remove(struct ffa_device *ffa_dev)
static int optee_ffa_probe(struct ffa_device *ffa_dev)
{
const struct ffa_dev_ops *ffa_ops;
const struct ffa_ops *ffa_ops;
unsigned int rpc_param_count;
struct tee_shm_pool *pool;
struct tee_device *teedev;
@ -793,11 +796,7 @@ static int optee_ffa_probe(struct ffa_device *ffa_dev)
u32 sec_caps;
int rc;
ffa_ops = ffa_dev_ops_get(ffa_dev);
if (!ffa_ops) {
pr_warn("failed \"method\" init: ffa\n");
return -ENOENT;
}
ffa_ops = ffa_dev->ops;
if (!optee_ffa_api_is_compatbile(ffa_dev, ffa_ops))
return -EINVAL;
@ -821,7 +820,6 @@ static int optee_ffa_probe(struct ffa_device *ffa_dev)
optee->ops = &optee_ffa_ops;
optee->ffa.ffa_dev = ffa_dev;
optee->ffa.ffa_ops = ffa_ops;
optee->rpc_param_count = rpc_param_count;
teedev = tee_device_alloc(&optee_ffa_clnt_desc, NULL, optee->pool,

1
drivers/tee/optee/optee_private.h
View file

@ -111,7 +111,6 @@ struct optee_smc {
*/
struct optee_ffa {
struct ffa_device *ffa_dev;
const struct ffa_dev_ops *ffa_ops;
/* Serializes access to @global_ids */
struct mutex mutex;
struct rhashtable global_ids;

36
include/linux/arm_ffa.h
View file

@ -17,6 +17,7 @@ struct ffa_device {
bool mode_32bit;
uuid_t uuid;
struct device dev;
const struct ffa_ops *ops;
};
#define to_ffa_dev(d) container_of(d, struct ffa_device, dev)
@ -47,17 +48,18 @@ static inline void *ffa_dev_get_drvdata(struct ffa_device *fdev)
}
#if IS_REACHABLE(CONFIG_ARM_FFA_TRANSPORT)
struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id);
struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id,
const struct ffa_ops *ops);
void ffa_device_unregister(struct ffa_device *ffa_dev);
int ffa_driver_register(struct ffa_driver *driver, struct module *owner,
const char *mod_name);
void ffa_driver_unregister(struct ffa_driver *driver);
bool ffa_device_is_valid(struct ffa_device *ffa_dev);
const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev);
#else
static inline
struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id)
struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id,
const struct ffa_ops *ops)
{
return NULL;
}
@ -76,11 +78,6 @@ static inline void ffa_driver_unregister(struct ffa_driver *driver) {}
static inline
bool ffa_device_is_valid(struct ffa_device *ffa_dev) { return false; }
static inline
const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev)
{
return NULL;
}
#endif /* CONFIG_ARM_FFA_TRANSPORT */
#define ffa_register(driver) \
@ -109,7 +106,10 @@ struct ffa_partition_info {
#define FFA_PARTITION_DIRECT_SEND BIT(1)
/* partition can send and receive indirect messages. */
#define FFA_PARTITION_INDIRECT_MSG BIT(2)
/* partition runs in the AArch64 execution state. */
#define FFA_PARTITION_AARCH64_EXEC BIT(8)
u32 properties;
u32 uuid[4];
};
/* For use with FFA_MSG_SEND_DIRECT_{REQ,RESP} which pass data via registers */
@ -257,18 +257,28 @@ struct ffa_mem_ops_args {
struct ffa_mem_region_attributes *attrs;
};
struct ffa_dev_ops {
struct ffa_info_ops {
u32 (*api_version_get)(void);
int (*partition_info_get)(const char *uuid_str,
struct ffa_partition_info *buffer);
};
struct ffa_msg_ops {
void (*mode_32bit_set)(struct ffa_device *dev);
int (*sync_send_receive)(struct ffa_device *dev,
struct ffa_send_direct_data *data);
};
struct ffa_mem_ops {
int (*memory_reclaim)(u64 g_handle, u32 flags);
int (*memory_share)(struct ffa_device *dev,
struct ffa_mem_ops_args *args);
int (*memory_lend)(struct ffa_device *dev,
struct ffa_mem_ops_args *args);
int (*memory_share)(struct ffa_mem_ops_args *args);
int (*memory_lend)(struct ffa_mem_ops_args *args);
};
struct ffa_ops {
const struct ffa_info_ops *info_ops;
const struct ffa_msg_ops *msg_ops;
const struct ffa_mem_ops *mem_ops;
};
#endif /* _LINUX_ARM_FFA_H */